Synthesis, structural characterization and magnetic properties of the monoclinic ordered double perovskites BaLaMSbO6, with M = Mn, Co and Ni

JOURNAL OF ALLOYS AND COMPOUNDS

卷:606

Article

Blanco, M. Cecilia¹  De Paoli, Juan M.¹  Ceppi, Sergio²  Tirao, G.²  Nassif, Vivian M.³  Guimpel, J.^4,5,6  Carbonio, Raul E.¹ 

[1] Univ Nacl Cordoba, Fac Ciencias Quim, Dept Fis Quim, INFIQC CONICET, RA-5000 Cordoba, Argentina

[2] Univ Nacl Cordoba, Fac Matemat Astron & Fis, IFEG CONICET, RA-5000 Cordoba, Argentina

[3] CNRS, Inst Neel, F-38042 Grenoble 9, France

[4] Univ Grenoble 1, F-38042 Grenoble 9, France

[5] Univ Nacl Cuyo, Ctr Atom Bariloche, Comis Nacl Energia Atom, RA-8400 Rio Negro, Argentina

[6] Univ Nacl Cuyo, Inst Balseiro, RA-8400 Rio Negro, Argentina

关键词: Double perovskites;    Magnetic properties;    X-ray emission spectroscopy;    Neutron powder diffraction;   

DOI  :  10.1016/j.jallcom.2014.04.013

来源: Elsevier

【 摘 要 】

Double perovskites BaLaMnSbO6, BaLaCoSbO6 and BaLaNiSbO6, were synthesized by conventional ceramic method in air, as polycrystalline powders. The Mn and Ni compounds belong to the I 2/m monoclinic space group, while the Co perovskite belongs to the I 4/m tetragonal space group. Effective presence of Mn2+ has been well established by X-ray emission spectroscopy for BaLaMnSbO6, and there is no evidence of Mn3+. BaLaCoSbO6 and BaLaNiSbO6 only show the expected 3D-antiferromagnetic behavior typical of super-superexchange interactions, while BaLaMnSbO6 displays signs of superparamagnetism in the 40160 K range, which arises from unbalanced antiferromagnetism inside nanoclusters formed by regions which are rich in Mn2+-O-2-Mn2+ paths. Neutron powder diffraction data for BaLaMnSbO6 reveals that at 3 K, only long range order antiferromagnetic arrangement of Mn2+ spins on 2d octahedral sites is obtained. (C) 2014 Elsevier B.V. All rights reserved.

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